Burner



Feb. 5, 1935. R. D. cHEEsMAN BURNER Filed Sept. 2, 1931 2 Sheets-Sheet 1Y INVENTOR R.,D. C/Aeeshah,

BY www@ ATTORNEY www,

Feb. 5, 1935.

R. D. CHEESMAN BURNER Filed Sept. 2, 1931 '2 Sheets-Sheet 2 ATTORNEYINVENTOR R- D. Chee'sman,

wm Tw Patented Feb. 5, 1935 y UNITED STATES PATENT OFFICE BURNERApplication September 2, 1931,` Serial No. 560,797

8 Claims.

This invention relates to burners. An object of the invention is theprovision of a -burner using various types of fuel in connection with asourceof air for producing flames of such types as will be required fora particular kind of work.

Another object of the invention is the provision of a self containedburner that will produce various forms and types of flames such as along or short or an oxidizing or reducing llame.

A'further object of the invention is the pro- Vision of a burner forproducing Various types of flames and with the burner being readilyadjustable for producing such types of flames.

A still further object of the invention is the provision ofa burnerusing either hot or cold airunder pressure with the quantity. of air andthe degree of pressure aiding in controlling the type of liame produced.

This invention will be best understood from a consideration of thefollowing detailed description, in View of the accompanying drawingsforming a part of the specification; nevertheless it is to be.understood that the invention is not conned tothe disclosure, beingsusceptible of such changes and modifications which shall define nomaterial departure from the salient features 0f the invention asexpressed in the appended claims.

Figure l is a side View of a burner constructed in accordance with theprinciples of my invention and shown applied to a kiln for producingcement;

Figure 2 is a longitudinal and verticalV section of the burner;

Figure 3 is a transverse Vertical section, taken along the line 3-3 ofFigure 2;

Figure 4 is a transverse vertical section, taken along the line 4 4 ofFigure 2;

Figure 5fis a fragmentary horizontal section, taken along the line 5-5of .Figure 2; and

Figure 6 is a View in perspective of. the gate valve for controlling theflow of air to one .section o-f the burner. Referring more particularlyto the drawings, l0 designates aV kiln, which maybe employed for anysuitable purpose such Vas the production of cement or the manufacture.of lime. In place of the kiln, ametallurgical furnace may besubstituted to be used in connection with the flame produced by myimproved burner.

The arrangement in Figure 1 includes a burner `unit 1'1, and a feedinghopper 12 having a reduced `outlet passage`l3 opening into the burner ina manner whichwill be rpresently described. The

hopper is supported by means of a framework, generally designated by thenumeral 14, and this framework is supported from a platform 15.

Connected with the inlet end of the burner unit 11 is a pipe 20, whichis in communication with a blower 21 of any approved construction. Thisfan or blower is driven in any approved manner by mechanism not shown.

An air pipe 22 connects the cyclone 0r air cleaner 23 with an air heater24 which receives clinkers from an opening 25 in a platform 26 whichsupports a movable hood 26a adapted to embrace the outlet end of theburner unit 11 and the lower end of the kiln 10.

During the burning of the ingredients for the manufacture of cement inthe rotary kiln 10 clinkers, as is well known, form, and these aredischarged into the air heater 24 and discharged through a rotarycooler. Thisis more clearly shown in Fig. l in which a side portion ofthe air heater 24 is broken away to reveal the clinker d materialfalling into a sloping trough leading into the elevated end of theinclined cooler. Air as indicated by the arrows in Fig. l, is drawnthrough the pipe 22 over the heated clinkers through the heater 24,whence the blower 21 forces the Yheated air into the burner ll. By thisconstruction the heat of the clinkers inthe member 24 and in the rotarycooler 27 is partially transferred to the air while the clinkers arematerially cooled.

The burner as shown in Figures 2 to 6, inclusive, includes an outershell 30 and an innertube or shell 31 which is co-axial with the outertube 30, thereby providing an annular space 32 between the two shellsfor the passage of fuel and air. A valve 33 controlled by a shaft 34 islocated near the inlet end of the tube or shell 31 so that by theregulation of this valve the amount of air entering the tube 31 will beregulated in accordance with the opening of the valve. Stops 35 securedto the inner walls of the tube 31 engage the Valve and stop it in anormal vertical or closed position.

A semi-annular valve closes the upper half of the annular passage 32 andis secured to a shaft 4l which is operated by a crank 42 for opening orclosing the valve as may be desired. It will be noted that the centralportion ofthe valve ris cut away to provide an opening 43 `to permit airto enter the inlet end of the tube 31 at all times regardless of theposition` of `the valve 40. A valve 45 similar in construction to thevalve 40, closes the lower half of the annular passage 32, and thisvalve is provided `with an open- .ing 46n which permits air at all timesto enter the inlet end of the tube 31.

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This valve is operated by a shaft 47 and crank 42a similar inconstruction to the shaft 41 and crank 42 of the valve 40. A plate 48extends transversely of the tube 30 and between the bearings for thevalve 40 and 45. It will be noted that the valve 45 engages an offsetportion 49 at the inlet end of the tube 31.

The tube 31 is retained in its co-axial position within the tube 30 bymeans of bolts 50 threaded into passages in the tube 30 and are lockedin position by nuts 51. These bolts extend radially inwardly of the tube30 and at approximately theA angie in order to direct the fuel throughthe` opening 56towards the outlet end of the tube 31. The valve 57 issecured to a shaft 58 which is mounted in bearings within the tube 13and is operated by a crank 59 shown in Figure 1. This valve closes apassage 60 in the discharge conduit 13 which `registers with the upperportion of the passage 32. When this valve is moved to the dotted lineposition, as shown at 57a in Figure 2, it will open the passage 60 butclose the lower end of the discharge conduit rso that rfuel will enterthe annular passage 32 instead of the inlet end of the tube 31.

The Valve 33 is operated by a crank 49a connected to the shaft 34. Onthe outlet. end of the tube 3l is mounted a sliding sleeve 70 which isprovided with slots 71 adapted to receive pins 72 formed on the outerwall of the tube 31. r1his vconstruction permits sliding of the sleeveon .the outlet end of the tube 31 by preventing rotation of said tube.Diametricallyvopposite links 73 are pivotally connected at 74 to thesleeve 70,

.and these links are pivotally connected at 75 with 'dered beforeutilization, the'tube 13 of the hopper 12 is preferable, since thispowdered fuel may be fed from the hopper to the conduit 13 in anypreferred mannerA from the feeding box 12a. A screw type of feed or anyother type of feed suitable for the purpose may be used. If it bedesired to employe the annuiar passage 32 for the fuel conduit, thevalve 57 moved to its dotted line position 57a in Figure 2, therebypreventing the passage of fuel'to the conduit 31 which is supplied byair under pressure from the blower '21 and the quantity of air admittedto the tube 31 is controlled by the valve 33. A quantity `of air isadmitted to theannular passage 32 by opening the Valves 40 and 45ftheproper degree in order to force the flame towards the outlet end of thetube 30. The quantity of air however which is admitted to the annularpassage 32 depends upon the typey of amedesired. If a short flame isrequired for the purpose a greater quantity of air is admitted to theannular passage 32 while Aa long flame is produced by the introductionof a smaller'cluantity of air to the annular space 32.

The amount of air passing through the passage 32 may be so regulated togive complete combustion of the fuel at the burner or the outlet end ofthe tube 3l. By introducing the fuel into the annular space 32 reducingflame may be obtained. On the other hand, when the air in sufficientquantity is forced through the annular space 32 and the fuel is admittedto the tube 31, an oxidizing flame is produced. The ends of the tubes 30and 31 coact in the sense that both contribute oxygen or fuel, or both,to maintain the burner flame.

l The length of the iiame when the fuel fed to the tube 31 is alsocontrolled by the quantity of air admitted to the tube 31 with the fuel.

Reciprocation of the sleeve 70 during the burning'of the mixtures tendsto shorten or lengthen 'the ame, and the use of this sleeve depends uponthe kind of work desired. If it be desired to extend the flame into therotary 10, in order to burn away the materials coating the inner wallsof the furnace, along flame is necessary, and this is produced byintroducing a smaller quantity of air with the fuel either in the tubenow of air through the annular space between 'f the inner and outertubes, common means for alternately supplying fuel to either the innertube or to the annular space. y

2. A burner comprising an outer tube, an inner 'co-axial tube, theyinner tube terminating short of the inlet end of the outer tube,`meansvfer supplying air under pressure to the iniet end of the outer tube,the inner tube forming with ne outer tube an'annular space, a valve inthe inner tubefor 'controlling the flow of air to the inner tube, valvesfor controlling the flowof air through the annular space between theinner and outer tubes, a conduit' connected with a source of fuel andextending through the outer 'tube .and into open communication with therinner tube, the conduit having a passage opening into the annularspace, a valve in the conduit adapted to close either the conduitto theinner tube or the passage to the annular space.

3. A burner comprising an outer tube, an inner Vco-axial tube, the innertube terminating yshort of the inlet end the outer tube, meansforsupplying air underpressure to the inlet end of the outer tube, theinner tube forming with the outer tube an annular space, a valve in theinner tube for controlling the flow of air to thev inner tube, valvesfor controlling the flow of air through the annular space' between theinner and outer tubes, means for supplying fuel to either the inner tubeor to the annular space, means for alternately controlling the supply offuel to either the inner tube or the annular space, the air valvesadapted to Vbe so regulated that a greater or less quantity'of air maybe supplied to the conduit which receives the fuel.

4. A burner'comprising an outer tube, an inner feo-axial tube-, formingran annular space with the outer tube, means for supplying air underpressure to both tubes, a valve in the inner tube for n "controlling theflow of'air to said tube, means for supplying fuel to said tube betweenthe valve and the outlet end of said tube, valves for controlling thesupply of air to the space, the fuel supply means being in communicationwith the space, and means for controlling alternately the supply of fuelto either the space or the inner tube.

5. A multiple-tube burner comprising an innermost central tube and anouter most encircling tube in diametrically spaced relation with thecentral tube, said tubes having coacting outlet ends, means forsupplying air under pressure to said tubes at points remote from saidends, a source of fuel supply, a conduit leading from the source of fuelsupply and communicating with the tubes intermediate the points of airsupply and said ends, and control means operable for inversely varyingthe amount of fuel supplied to the respective tubes.

6. A multiple-tube burner comprising an innermost central tube and anoutermost encircling tube in diametrically spaced relation with thecentral tube, said tubes having coaeting outlet ends, means forsupplying air under pressure to said tubes at points remote from saidends, a source of fuel supply, a conduit leading from the source of fuelsupply and communicating with the tubes intermediate the points of airsupply and said ends, and a Valve for closing communication, as desired,between the conduit and either the innermost or outermost tube.

7. A multiple-tube burner comprising an innermost central tube and anoutermost encircling tube in diametrically spaced relation with thecentral tube, said tubes having coacting outlet ends, means forsupplying air under pressure to said tubes at points remote from saidends, a source of fuel supply, a conduit leading from the source of fuelsupply and communicating with the tubes intermediate the points of airsupply and said ends, and a valve for alternately opening and closingcommunication between the conduit and tubes for dividing the fuelpassing through the conduit and distributing it to the innermost andoutermost tubes.

8. A multiple-tube burner comprising an innermost central tube and anoutermost encircling tube in diametrically spaced relation with thecentral tube, said tubes having coacting outlet ends, means forsupplying air under pressure to said tubes at points remote from Saidends, a source of fuel supply, a conduit leading from the source of fuelsupply and communicating with the tubes intermediate the points of airsupply and said ends, and a valve for permitting communication betweenthe conduit and either one of the tubes while simultaneously closingcommunication between the conduit and the other tube, whereby the fueldelivered by the conduit may be discharged into either one of the tubesas desired exclusively of the other tube.

RICHARD D. CHEESMAN.

